feat: add new OpenSpec skills for change management and onboarding

- Created `openspec-ff-change` skill for fast-forward artifact creation.
- Introduced `openspec-new-change` skill for structured change creation.
- Developed `openspec-onboard` skill for guided onboarding through OpenSpec workflow.
- Added `openspec-sync-specs` skill for syncing delta specs to main specs.
- Implemented `openspec-verify-change` skill for verifying implementation against change artifacts.
- Updated `.gitignore` to exclude OpenSpec generated files.
- Added `skills-lock.json` to manage skill dependencies.

.agents/skills/shadcn/rules/composition.md

@@ -0,0 +1,195 @@
+# Component Composition
+
+## Contents
+
+- Items always inside their Group component
+- Callouts use Alert
+- Empty states use Empty component
+- Toast notifications use sonner
+- Choosing between overlay components
+- Dialog, Sheet, and Drawer always need a Title
+- Card structure
+- Button has no isPending or isLoading prop
+- TabsTrigger must be inside TabsList
+- Avatar always needs AvatarFallback
+- Use Separator instead of raw hr or border divs
+- Use Skeleton for loading placeholders
+- Use Badge instead of custom styled spans
+
+---
+
+## Items always inside their Group component
+
+Never render items directly inside the content container.
+
+**Incorrect:**
+
+```tsx
+<SelectContent>
+  <SelectItem value="apple">Apple</SelectItem>
+  <SelectItem value="banana">Banana</SelectItem>
+</SelectContent>
+```
+
+**Correct:**
+
+```tsx
+<SelectContent>
+  <SelectGroup>
+    <SelectItem value="apple">Apple</SelectItem>
+    <SelectItem value="banana">Banana</SelectItem>
+  </SelectGroup>
+</SelectContent>
+```
+
+This applies to all group-based components:
+
+| Item | Group |
+|------|-------|
+| `SelectItem`, `SelectLabel` | `SelectGroup` |
+| `DropdownMenuItem`, `DropdownMenuLabel`, `DropdownMenuSub` | `DropdownMenuGroup` |
+| `MenubarItem` | `MenubarGroup` |
+| `ContextMenuItem` | `ContextMenuGroup` |
+| `CommandItem` | `CommandGroup` |
+
+---
+
+## Callouts use Alert
+
+```tsx
+<Alert>
+  <AlertTitle>Warning</AlertTitle>
+  <AlertDescription>Something needs attention.</AlertDescription>
+</Alert>
+```
+
+---
+
+## Empty states use Empty component
+
+```tsx
+<Empty>
+  <EmptyHeader>
+    <EmptyMedia variant="icon"><FolderIcon /></EmptyMedia>
+    <EmptyTitle>No projects yet</EmptyTitle>
+    <EmptyDescription>Get started by creating a new project.</EmptyDescription>
+  </EmptyHeader>
+  <EmptyContent>
+    <Button>Create Project</Button>
+  </EmptyContent>
+</Empty>
+```
+
+---
+
+## Toast notifications use sonner
+
+```tsx
+import { toast } from "sonner"
+
+toast.success("Changes saved.")
+toast.error("Something went wrong.")
+toast("File deleted.", {
+  action: { label: "Undo", onClick: () => undoDelete() },
+})
+```
+
+---
+
+## Choosing between overlay components
+
+| Use case | Component |
+|----------|-----------|
+| Focused task that requires input | `Dialog` |
+| Destructive action confirmation | `AlertDialog` |
+| Side panel with details or filters | `Sheet` |
+| Mobile-first bottom panel | `Drawer` |
+| Quick info on hover | `HoverCard` |
+| Small contextual content on click | `Popover` |
+
+---
+
+## Dialog, Sheet, and Drawer always need a Title
+
+`DialogTitle`, `SheetTitle`, `DrawerTitle` are required for accessibility. Use `className="sr-only"` if visually hidden.
+
+```tsx
+<DialogContent>
+  <DialogHeader>
+    <DialogTitle>Edit Profile</DialogTitle>
+    <DialogDescription>Update your profile.</DialogDescription>
+  </DialogHeader>
+  ...
+</DialogContent>
+```
+
+---
+
+## Card structure
+
+Use full composition — don't dump everything into `CardContent`:
+
+```tsx
+<Card>
+  <CardHeader>
+    <CardTitle>Team Members</CardTitle>
+    <CardDescription>Manage your team.</CardDescription>
+  </CardHeader>
+  <CardContent>...</CardContent>
+  <CardFooter>
+    <Button>Invite</Button>
+  </CardFooter>
+</Card>
+```
+
+---
+
+## Button has no isPending or isLoading prop
+
+Compose with `Spinner` + `data-icon` + `disabled`:
+
+```tsx
+<Button disabled>
+  <Spinner data-icon="inline-start" />
+  Saving...
+</Button>
+```
+
+---
+
+## TabsTrigger must be inside TabsList
+
+Never render `TabsTrigger` directly inside `Tabs` — always wrap in `TabsList`:
+
+```tsx
+<Tabs defaultValue="account">
+  <TabsList>
+    <TabsTrigger value="account">Account</TabsTrigger>
+    <TabsTrigger value="password">Password</TabsTrigger>
+  </TabsList>
+  <TabsContent value="account">...</TabsContent>
+</Tabs>
+```
+
+---
+
+## Avatar always needs AvatarFallback
+
+Always include `AvatarFallback` for when the image fails to load:
+
+```tsx
+<Avatar>
+  <AvatarImage src="/avatar.png" alt="User" />
+  <AvatarFallback>JD</AvatarFallback>
+</Avatar>
+```
+
+---
+
+## Use existing components instead of custom markup
+
+| Instead of | Use |
+|---|---|
+| `<hr>` or `<div className="border-t">` | `<Separator />` |
+| `<div className="animate-pulse">` with styled divs | `<Skeleton className="h-4 w-3/4" />` |
+| `<span className="rounded-full bg-green-100 ...">` | `<Badge variant="secondary">` |